What Diane Blair's papers tell us about the Clintons, and why people preserve their archives.

All the Northeast is covered in snow, and the sound and clamor of Washington is muffled. The federal government took a day off; the news is full of weather. Not a bad time to ponder why people do what they do—more specifically, why witnesses to history often take notes on what they see and hear, and in time leave their papers to universities and libraries. Obviously we're keying off this week's story of Diane Blair, a close friend of Hillary Clinton, who died in 2000 and whose papers were given by her husband to the University of Arkansas. There they were kept sealed until 2010. An enterprising reporter for the...